Ozone concentration metering device and method based on potassium iodide

Abstract

The invention relates to an ozone concentration metering device and method based on potassium iodide, and belongs to the technical field of water ozone concentration metering. The device comprises a developing reactor used for extracting a sample solution to be detected, a color developing agent inlet of the developing reactor is communicated with a liquid supply mechanism, after the developing reactor extracts the sample solution to be detected, the liquid supply mechanism sequentially adds a potassium iodide solution and a DPD solution into the developing reactor, and the ozone concentration metering device further comprises a gas source communicated with the developing reactor. When the potassium iodide solution is added into the color development reactor, nitrogen or inert gas is introduced into the reaction tank through the gas source, oxygen generated in the color development reactor is replaced, the situation that the concentration of free iodine is too high due to the oxidation effect of oxygen on potassium iodide is avoided, and it is ensured that the dosage of DPD is matched with the concentration of ozone; and errors in the ozone concentration metering detection process are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of water body ozone concentration measurement, and specifically relates to an ozone concentration measurement device and method based on potassium iodide. Background Art

[0002] Potassium iodide-DPD (N,N-diethyl-p-phenylenediamine) is a classic method widely used in the detection of ozone concentration in water. This method uses potassium iodide to undergo a redox reaction with ozone, and the generated free iodine reacts with DPD to make the water appear red, thereby accurately measuring the ozone concentration in the water to be tested. This method is convenient for the verification or calibration of ozone concentration colorimetric measuring devices, and has been widely used in environmental monitoring, water treatment and other fields.

[0003] However, the existing ozone concentration metering devices and methods have certain shortcomings in practical applications. First, the oxygen generated by the reaction of potassium iodide and ozone has an oxidizing effect on the remaining potassium iodide in the device, resulting in a high concentration of free iodine produced by the reaction. In order to decolorize the water in the device, the reaction needs to consume more DPD solution, which affects the experimental accuracy. Secondly, a large amount of manual operation is required when configuring potassium iodide solution and DPD solution, as well as in the process of processing the sample liquid to be tested. This is not only time-consuming and labor-intensive, but also easily affects the detection accuracy due to improper operation. Therefore, it is necessary to improve the existing ozone concentration metering device and method to improve detection efficiency and accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide an ozone concentration metering device and method based on potassium iodide in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A method for measuring ozone concentration based on potassium iodide comprises the following steps:

[0007] Step 1, adding the sample solution to be tested into the color development reactor;

[0008] Step 2: adding potassium iodide solution into the color development reactor through the liquid supply mechanism 1, so that the ozone in the sample solution to be tested reacts with potassium iodide to generate free iodine;

[0009] Step 3, adding DPD solution into the color development reactor through the second liquid supply mechanism, so that free iodine reacts with DPD to generate a red substance;

[0010] Step 4: Analyze the ozone concentration of the sample solution according to the color change of the solution in the color development reactor and the added amount of the sample solution and the DPD solution;

[0011] Wherein, in the step 2, during the process of adding the potassium iodide solution, nitrogen or inert gas is introduced into the color development reactor through the gas source, and the exhaust port of the color development reactor is opened to discharge the oxygen generated in the color development reactor.

[0012] A potassium iodide-based ozone concentration metering device comprises a colorimetric reactor for extracting a sample liquid to be tested, a colorimetric agent inlet of the colorimetric reactor is connected with a liquid supply mechanism, and the liquid supply mechanism is divided into a first liquid supply mechanism and a second liquid supply mechanism. After the colorimetric reactor extracts the sample liquid to be tested, the first liquid supply mechanism and the second liquid supply mechanism sequentially add a potassium iodide solution and a DPD solution into the colorimetric reactor.

[0013] The ozone concentration metering device also includes a gas source connected to the color developing reactor, and the color developing reactor is provided with an exhaust port. When potassium iodide is added to the color developing reactor, the gas source introduces nitrogen or inert gas into the color developing reactor, and the exhaust port of the color developing reactor is opened to discharge the oxygen generated in the color developing reactor.

[0014] As a further optimization scheme of the present invention, the device also includes a water supply mechanism, a color developer delivery pipe system is provided between the color development reactor and the liquid supply mechanism one and the liquid supply mechanism two, and a distilled water delivery pipe system is provided between the water supply mechanism and the liquid supply mechanism one and the liquid supply mechanism two, and liquid level sensors are provided in the color development reactor, the liquid supply mechanism one and the liquid supply mechanism two.

[0015] As a further optimization scheme of the present invention, when the sample liquid is extracted, the actual amount of the sample liquid added is detected by the liquid level sensor, and when the DPD solution is added, the actual amount of the DPD solution added is detected by the liquid level sensor.

[0016] As a further optimization scheme of the present invention, the liquid supply mechanism 1 includes a dissolving tank, a material receiving assembly arranged in the dissolving tank, a material storage tank arranged above the dissolving tank, a discharge valve arranged at the bottom of the storage tank, and a discharge pipe arranged at the bottom of the discharge valve and extending into the dissolving tank. The storage tank is used to store solid color developer. The dissolving tank is provided with a load sensor. The load sensor is used to detect the weight of the solid color developer received by the material receiving assembly. The water level setting value is set according to the weight detection result. During the process of adding distilled water to the liquid supply mechanism, when the water level of the liquid supply mechanism reaches the water level setting value, the distilled water delivery pipeline is closed. The structure of the liquid supply mechanism 2 is the same as that of the liquid supply mechanism 1.

[0017] As a further optimization scheme of the present invention, a rotating rod is fixedly provided on the material receiving assembly, and the rotating rod is rotatably arranged at the bottom of the load sensor, and a driving member for driving the rotating rod to rotate is provided on the dissolving tank.

[0018] As a further optimization scheme of the present invention, the material receiving assembly consists of an outer cylinder and an inner cylinder fixed on the inner wall of the outer cylinder. A liquid discharge port is provided on the outer wall of the outer cylinder. When receiving the solid color developer, the inner cylinder is located directly below the discharge pipe.

[0019] As a further optimization scheme of the present invention, the distilled water delivery pipe system includes a diversion pipe arranged at the water outlet of the water supply mechanism, and a third water pump and two three-way valves arranged on the diversion pipe. The diversion pipe has a main pipe and two branch pipes corresponding to the two three-way valves respectively, and the third water pump is arranged on the main pipe.

[0020] As a further optimization scheme of the present invention, the distilled water delivery pipe system also includes two drain pipes corresponding to the two branch pipes respectively, the two drain pipes are respectively connected to the two liquid supply mechanisms, and the three ports of the three-way valve are respectively connected to the corresponding branch pipes, the drain pipe and the discharge pipe.

[0021] As a further optimization scheme of the present invention, a bypass pipe for conveying nitrogen or inert gas is provided on the liquid supply pipe, and a solenoid valve is provided on the bypass pipe, and exhaust valves are provided on the reaction tank and the discharge pipe.

[0022] The beneficial effects of the present invention are:

[0023] 1) When adding potassium iodide solution to the color development reactor, nitrogen or inert gas is introduced into the reaction tank through the gas source to replace the oxygen generated in the color development reactor, thereby avoiding the oxidation of potassium iodide by oxygen, resulting in a high concentration of free iodine, ensuring that the amount of DPD is matched with the ozone concentration, and improving the accuracy of ozone concentration measurement and detection;

[0024] 2) The present invention controls the sample liquid and the color developer delivered by the sampling tube and the color developer delivery tube system through each liquid level setting value. The actual amount of the sample liquid and the color developer added and the concentration of the color developer are obtained by the liquid level sensor and the load sensor. The preparation of the color developer and the reaction of the sample liquid can be automatically controlled, which saves manpower and further improves the accuracy of detection;

[0025] 3) When the developer is prepared in the present invention, a double-layered material receiving assembly is arranged in the dissolving tank. When the developer is added to the dissolving tank, it first falls into the inner cylinder of the material receiving assembly to prevent it from scattering out from the discharge port of the outer cylinder. The material receiving assembly is also used to fully mix the solid developer with distilled water, thereby improving the accuracy and efficiency of the developer preparation.

[0026] 4) After each ozone concentration measurement test, the present invention uses the remaining distilled water in the water supply mechanism to clean the liquid supply mechanism, the color development reactor and related pipelines to ensure that the inside of the device remains clean during subsequent testing work, and the distilled water delivery pipe system is connected to the dissolution tank and the discharge pipe of the liquid supply mechanism, which can clean the solid color developer remaining in the discharge pipe to prevent it from being affected by moisture and deterioration and affecting subsequent testing work;

[0027] 5) The gas source connected to the color developing reactor of the present invention is also used to remove water vapor in the color developing reactor after ozone metering detection. The color developer delivery pipe system is provided with a bypass pipe for delivering gas. The gas in the gas source can also enter each liquid supply mechanism through the color developer delivery pipe system to remove water vapor in the liquid supply mechanism, thereby further reducing errors in subsequent detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 is a schematic diagram of a liquid supply mechanism of the present invention;

[0030] Figure 3 It is a schematic diagram of the internal structure of the liquid supply mechanism of the present invention;

[0031] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0032] In the figure: 1, color reactor; 2, liquid supply mechanism 1; 3, liquid supply mechanism 2; 4, gas source; 5, water supply mechanism; 6, color developer delivery pipe system; 7, distilled water delivery pipe system; 11, reaction tank; 12, first water pump; 13, first drain valve; 21, dissolving tank; 22, material receiving assembly; 23, storage tank; 24, discharge valve; 25, discharge pipe; 26, rotating rod; 27, driving member; 28, second drain valve; 29, limit frame; 51, water tank; 5 2. Heater; 53. Lifting component; 54. Water inlet valve; 61. Second water pump; 62. Solenoid valve; 71. Third water pump; 72. Three-way valve; 73. Drain pipe; 221. Outer tube; 222. Inner tube; 223. Drain port; 261. Worm; 262. Worm wheel; 273. First gear; 274. Second gear; H. Liquid level sensor; L. Load sensor; T. Temperature sensor; P. Air pressure sensor; E. Exhaust valve; C. Camera. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0034] First embodiment

[0035] like Figure 1 As shown, this embodiment relates to an ozone concentration measurement method based on potassium iodide, comprising the following steps:

[0036] Step 1: After starting the first water pump 12, the test liquid is extracted from the sampling point, thereby adding the test liquid to the color development reactor 1. When the liquid level in the color development reactor 1 reaches the first liquid level setting value, the first water pump 12 is turned off. After the water pump 12 is turned off for a period of time, the actual amount of the test liquid added is detected by the liquid level sensor H in the color development reactor 1.

[0037] Step 2: Add potassium iodide solution to the color reactor 1 through the liquid supply mechanism 1-2. During the process of adding potassium iodide solution, when the liquid level in the color reactor 1 reaches the second liquid level setting value, the second water pump 61 corresponding to the liquid supply mechanism 1-2 is turned off. After a period of time when the second water pump 61 corresponding to the liquid supply mechanism 1-2 is turned off, the actual liquid level of the reaction tank 11 at this time is detected by the liquid level sensor H in the color reactor 1. During the process of adding potassium iodide solution, nitrogen or inert gas is introduced into the color reactor 1 through the gas source 4, and the exhaust port of the color reactor 1 is opened to discharge the oxygen generated in the color reactor 1.

[0038] Step 3: Add DPD solution into the color development reactor 1 through the liquid supply mechanism 2 3 to make free iodine react with DPD to generate red substance. The actual amount of DPD solution added is detected by the liquid level sensor H in the color development reactor 1.

[0039] Step 4: Analyze the ozone concentration of the sample solution according to the color change of the solution in the color development reactor 1 and the added amounts of the sample solution and the DPD solution.

[0040] Second embodiment

[0041] like Figure 1-3 As shown, this embodiment relates to an ozone concentration metering device based on potassium iodide, which is used to implement the ozone concentration metering method based on potassium iodide in the previous embodiment. The device includes a color development reactor 1 for extracting a sample liquid to be tested, and a liquid supply mechanism for adding a color developer solution to the color development reactor 1. The liquid supply mechanism is divided into a liquid supply mechanism 1 2 and a liquid supply mechanism 2 3, and the color developer solution includes adding potassium iodide solution and DPD solution. Two color developer inlets are provided on the color development reactor 1, and the two color developer inlets are connected to the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3 respectively.

[0042] Before the color reactor 1 extracts the sample liquid to be tested, the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3 store the pre-prepared potassium iodide solution and the DPD solution. After the color reactor 1 extracts the sample liquid to be tested, the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3 sequentially add the potassium iodide solution and the DPD solution into the color reactor 1. The outer shell of the color reactor 1 is transparent as a whole or partially transparent, and the color change of the water in the color reactor 1 can be observed or detected with the help of the camera C.

[0043] After adding potassium iodide solution, ozone in the sample solution reacts with potassium iodide to generate free iodine and oxygen. After adding DPD solution, free iodine in the water reacts with DPD to generate red substances, and the red color in the water gradually deepens. When the red color in the water deepens to the standard degree, the ozone concentration in the water can be calculated based on the amount of DPD solution and sample solution added at this time.

[0044] The ozone concentration metering device also includes a gas source 4 connected to the color reactor 1, and the color reactor 1 is provided with an exhaust port. When potassium iodide is added to the color reactor 1, the gas source 4 introduces nitrogen into the color reactor 1. The exhaust port of the color reactor 1 is opened to discharge the oxygen generated in the color reactor 1, and the oxygen dissolved in the water body can be replaced by nitrogen. Avoid the ozone concentration metering error caused by the oxidation of potassium iodide by oxygen. In addition, the above-mentioned nitrogen can also be replaced by an inert gas.

[0045] Specifically, a color developer delivery pipe system 6 is provided between the color development reactor 1 and the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3, and the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3 add potassium iodide solution and DPD solution to the color development reactor 1 through the color developer delivery pipe system 6. The ozone concentration metering device also includes a water supply mechanism 5, and a distilled water delivery pipe system 7 is provided between the water supply mechanism 5 and the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3. Liquid level sensors H are provided in the color development reactor 1, the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3, and the water supply mechanism 5 delivers distilled water to the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3 through the distilled water delivery pipe system 7.

[0046] The color development reactor 1 includes a reaction tank 11 and a sampling tube provided at the sampling port of the reaction tank 11, and a first water pump 12 and a check valve are provided on the sampling tube. A drain port is provided at the bottom of the reaction tank 11, and a first drain valve 13 is provided on the drain port. The first water pump 12 is preferably a peristaltic pump. The color developer delivery pipe system 6 includes two liquid supply pipes provided between the color development reactor 1 and the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3, and a second water pump 61 and a check valve are provided on the liquid supply pipe.

[0047] The device is suitable for scenes with a high frequency of ozone concentration detection. For example, when ozone concentration detection is performed in a water plant, the sampling point of the sampling tube of the color reactor 1 can be set in the ozone contact oxidation tank. The device also includes a controller connected to the color reactor 1, the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3. The controller is preferably a PLC controller, which is also connected to the gas source 4, the color developer delivery pipe system 6 and the water supply mechanism 5 and the distilled water delivery pipe system 7. Before extracting the sample liquid to be tested, the controller sends control instructions to the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3 respectively to prepare potassium iodide solution and DPD solution. During the extraction of the sample liquid to be tested, the controller starts the first water pump 12, extracts the sample liquid to be tested from the sampling point through the sampling tube, and after the sample liquid to be tested enters the reaction tank 11, the liquid level change of the reaction tank 11 is detected by the liquid level sensor H in the color reactor 1. When the liquid level in the color reactor 1 reaches the first liquid level setting value, the first water pump 12 is turned off. After the first water pump 12 is turned off for a period of time, the actual amount of the sample liquid added is detected by the liquid level sensor H in the color development reactor 1 .

[0048] Then, potassium iodide solution is added to the color reactor 1. During the process of adding potassium iodide solution, when the liquid level in the color reactor 1 reaches the second liquid level setting value, the second water pump 61 corresponding to the liquid supply mechanism 2 is turned off. After the second water pump 61 corresponding to the liquid supply mechanism 2 is turned off for a period of time, the actual liquid level of the reaction tank 11 at this time is detected by the liquid level sensor H in the color reactor 1.

[0049] After that, DPD solution is added to the reaction tank 11, and the actual amount of DPD solution added is detected by the liquid level sensor H in the color reactor 1. When the liquid supply mechanism 23 prepares the DPD solution, the DPD added thereto is weighed and the water level therein is measured, so the concentration of the DPD solution is known. Then, according to the actual amount of DPD solution added corresponding to the red color in the water body in the reaction tank 11 when it deepens to the standard degree, the actual amount of the sample liquid added, and the relevant chemical reaction equation of the chemical reaction occurring in the color reactor 1, the ozone concentration of the sample liquid to be tested can be calculated by the controller. The controller connected to the color reactor 1 is also connected to a display for displaying the ozone concentration detection result of the sample liquid to be tested.

[0050] Since the color developer used in the ozone detection process is easy to deteriorate when stored for a long time, in order to improve the accuracy of the detection result, the color developer needs to be prepared and used immediately. In this embodiment, before each extraction of the sample liquid to be tested, the potassium iodide solution and the DPD solution are prepared once using the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3. The liquid supply mechanism 1 2 includes a dissolving tank 21, a material receiving assembly 22 arranged in the dissolving tank 21, a storage tank 23 arranged above the dissolving tank 21, a discharge valve 24 arranged at the bottom of the storage tank 23, and a discharge pipe 25 arranged at the bottom of the discharge valve 24 and extending into the dissolving tank 21. The storage tank 23 is used to store solid color developers, and the material receiving assembly 22 is used to receive solid color developers. The discharge pipe 25 is fixed to the top wall of the dissolving tank 21. A load sensor L is fixedly installed below the top wall of the dissolving tank 21. The load sensor L is used to detect the weight of the solid color developer in the material receiving component 22. The water level setting value is set according to the weight detection result. During the process of adding distilled water to the liquid supply mechanism 2, when the water level of the dissolving tank 21 reaches the water level setting value, the distilled water delivery pipe system 7 is closed.

[0051] The receiving assembly 22 is composed of an outer cylinder 221 and an inner cylinder 222 fixed on the inner wall of the outer cylinder 221. The outer wall of the outer cylinder 221 is provided with a liquid discharge port 223. When receiving the solid color developer, the inner cylinder 222 is located directly below the discharge pipe 25. The upper area of ​​the side wall of the inner cylinder 222 is provided with a through hole, which helps to fully mix the solid color developer with distilled water. A rotating rod 26 is fixed on the top of the bottom wall of the outer cylinder 221. The rotating rod 26 is located at the axis of the outer cylinder 221, and the rotating rod 26 is rotatably arranged at the bottom of the load sensor L. The dissolving tank 21 is provided with a driving member 27 for driving the rotating rod 26 to rotate. The driving member 27 includes a motor fixedly mounted on the outside of the dissolving tank 21, a worm 261 fixedly mounted on the output end of the motor, a worm wheel 262 meshingly connected to one side of the worm 261, a first gear 273 fixedly mounted on the bottom of the worm wheel 262, and a second gear 274 meshingly connected to the first gear 273, and the second gear 274 is fixedly mounted on the rotating rod 26. The worm 261 penetrates the side wall of the dissolving tank 21, and the dissolving tank 21 is rotatably connected to the worm 261. A mounting frame is provided on the upper part of the inner side wall of the dissolving tank 21, and the bottom of the first gear 273 is rotatably mounted on the mounting frame. In addition, a second drain valve 28 is provided at the bottom discharge port of the dissolving tank 21, a cylindrical rod body is provided at the bottom center of the bottom wall of the outer cylinder 221, a limiting frame 29 is provided at the bottom of the inner side wall of the dissolving tank 21, and the rod body at the bottom of the outer cylinder 221 penetrates the limiting frame 29, and the limiting frame 29 is used to restrict the radial displacement of the rod body to avoid the horizontal position deviation of the receiving assembly 22.

[0052] The structure of the liquid supply mechanism 2 3 is the same as that of the liquid supply mechanism 1 2, and also has the above-mentioned structure constituting the liquid supply mechanism 2 3. The specific difference between the liquid supply mechanism 2 3 and the liquid supply mechanism 1 2 is only the difference in the size of each structure in the liquid supply mechanism. The storage tanks of the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3 are used to store solid potassium iodide and DPD respectively. In addition, the water level setting values ​​corresponding to the liquid supply mechanism 1 2 and the liquid supply mechanism 2 3 are determined according to the weight of the color developer added to the dissolving tank.

[0053] Before preparing the potassium iodide solution, the controller drives the rotating rod 26 to reset through the driving member 27, so that the inner cylinder 222 of the material receiving assembly 22 is located directly below the discharge pipe 25, and the second drain valve 28 is closed. The above reset can be achieved by setting an angle sensor on the driving member 27, the rotating rod 26 or the material receiving assembly 22, which is a conventional technical means, so it will not be described in detail.

[0054] When preparing the potassium iodide solution, the discharge valve 24 is opened for a period of time and then closed, and part of the solid potassium iodide in the storage tank 23 falls into the inner cylinder 222. The solid potassium iodide in the docking assembly 22 is weighed by the load sensor L, and the water level setting value is set according to the weight of the solid potassium iodide. The controller guides the distilled water in the water supply mechanism 5 into the dissolving tank 21 through the distilled water delivery pipe system 7. When the water level in the dissolving tank 21 reaches the water level setting value, the distilled water delivery pipe system 7 is closed. After a period of time after the distilled water delivery pipe system 7 is closed, the actual water level of the dissolving tank 21 is measured by the liquid level sensor H on the dissolving tank 21 to determine the concentration of the potassium iodide solution.

[0055] Then, the driving member 27 drives the rotating rod 26 and the material receiving assembly 22 to rotate, so that the solid potassium iodide is fully dissolved in the distilled water. When the potassium iodide solution is added to the color development reactor 1, the second drain valve 28 is opened to allow the potassium iodide solution to enter the color development agent delivery pipe system 6. The process of preparing the DPD solution is consistent with the above process, so it will not be described in detail.

[0056] Furthermore, the distilled water delivery pipe system 7 includes a shunt pipe provided at the water outlet of the water supply mechanism 5, and a third water pump 71 and two three-way valves 72 provided on the shunt pipe. The shunt pipe has a main pipe and two branch pipes corresponding to the two three-way valves 72 respectively. The third water pump 71 is provided on the main pipe. The distilled water delivery pipe system 7 also includes two drain pipes 73 corresponding to the two branch pipes respectively. The two drain pipes 73 are respectively connected to the dissolving tanks of the two liquid supply mechanisms. The three ports of the three-way valve 72 are respectively connected to the branch pipes, drain pipes and discharge pipes at the corresponding liquid supply mechanisms. The water supply mechanism 5 is composed of a water tank 51, a heater 52 provided outside the water tank 51, a lifting component 53 provided below the heater 52, and a water inlet pipe provided at the water inlet of the water tank 51. The water inlet pipe is provided with a water inlet valve 54, and the water inlet pipe is connected to the tap water supply pipe. The water outlet of the water tank 51 is connected to the main pipe of the shunt pipe.

[0057] Before dispensing the developer, the controller opens the water inlet valve 54, and after adding a sufficient amount of tap water to the water tank 51, closes the water inlet valve 54, and lifts the heater 52 with the lifting component 53, so that the heater 52 surrounds the water tank 51 and heats the water tank 51. The top of the water tank 51 is made of heat-insulating material, and the remaining parts of the water tank 51 are made of materials with good thermal conductivity. After the tap water in the water tank 51 boils, it forms distilled water, and then the lifting component 53 drives the heater 52 to move down and reset. After the distilled water is cooled, the distilled water can be transported to the liquid supply mechanism through the distilled water delivery pipe system 7. When delivering distilled water, the third water valve 73 is opened, the ports corresponding to the three-way valve 72 and the branch pipe and the drain pipe 73 are opened, and the third water pump 71 delivers the distilled water to the dissolving tank of the liquid supply mechanism. When the water level in the dissolving tank reaches the set value, the third water pump 71 is closed.

[0058] In addition, during each ozone concentration detection process, the amount of distilled water in the water tank 51 is greater than the required amount for configuring the color developer. After the ozone concentration detection is completed, the port connected to the discharge pipe of each liquid supply mechanism of the three-way valve 72 is opened, and the remaining distilled water in the water tank is transported to the discharge pipe and the dissolution tank through the distilled water delivery pipe system 7, and the material receiving assembly is driven to rotate through the driving parts of each liquid supply mechanism, and each liquid supply mechanism is cleaned. The first drain valve 13 and the second drain valve of each liquid supply mechanism are opened to allow the liquid in the liquid supply mechanism to enter the color developer delivery pipe system 6 and the color developing reactor 1, and the liquid is then discharged from the color developing reactor 1 to clean the color developer delivery pipe system 6 and the color developing reactor 1.

[0059] In addition, a bypass pipe for conveying nitrogen is provided on the liquid supply pipe, and two solenoid valves 62 are provided on the bypass pipe. The two solenoid valves 62 are respectively located at both ends of the bypass pipe and connected to the liquid supply pipe, and the second water pump 61 and the check valve on the bypass pipe corresponding to the liquid supply pipe are both located between the two solenoid valves 62. An exhaust valve E is provided on the reaction tank 11 and the discharge pipe of each liquid supply mechanism, and the solenoid valve 62 remains closed during the ozone concentration detection process and the cleaning process of the ozone concentration metering device. A heating pipe is provided on the outside of the pipeline between the gas source 4 and the color reactor 1. After each measurement, the solenoid valve 62 and the exhaust valve E are opened, and nitrogen is introduced into the color reactor 1 through the gas source 4, and the nitrogen is heated by the heating pipe. Part of the nitrogen in the color reactor 1 enters each liquid supply mechanism through the color developer delivery pipe system 6, and the nitrogen in the color reactor 1 and the liquid supply mechanism is discharged from the exhaust valve E, and the water vapor in the color reactor 1 and the liquid supply mechanism is removed to prevent the residual water stains from interfering with the subsequent ozone concentration detection. The color reactor 1 and each liquid supply mechanism are also provided with a temperature sensor T and an air pressure sensor P, which are used to measure the temperature and pressure in the color reactor 1 and each liquid supply mechanism, and further improve the accuracy of the detection result. In addition, a camera C can be set on one side of the color reactor 1, and a white background plate can be set on the other side of the color reactor 1. The color change in the color reactor 1 can be identified by the camera C in cooperation with the controller, so as to save the work of manually observing the color change in the color reactor 1.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for measuring ozone concentration based on potassium iodide, characterized in that: The following steps are involved: Step 1, adding the sample solution to be tested into the color development reactor; Step 2: adding potassium iodide solution into the color development reactor through the liquid supply mechanism 1, so that the ozone in the sample solution to be tested reacts with potassium iodide to generate free iodine; Step 3, adding DPD solution into the color development reactor through the second liquid supply mechanism, so that free iodine reacts with DPD to generate a red substance; Step 4: Analyze the ozone concentration of the sample solution according to the color change of the solution in the color development reactor and the added amount of the sample solution and the DPD solution; Wherein, in the step 2, during the process of adding the potassium iodide solution, nitrogen or inert gas is introduced into the color development reactor through the gas source, and the exhaust port of the color development reactor is opened to discharge the oxygen generated in the color development reactor.

2. A potassium iodide-based ozone concentration metering device for implementing the method according to claim 1, characterized in that: The invention comprises a color developing reactor for extracting a sample liquid to be tested, wherein the developer inlet of the color developing reactor is connected with a liquid supply mechanism, and the liquid supply mechanism is divided into a first liquid supply mechanism and a second liquid supply mechanism. After the color developing reactor extracts the sample liquid to be tested, the first liquid supply mechanism and the second liquid supply mechanism sequentially add a potassium iodide solution and a DPD solution into the color developing reactor; The ozone concentration metering device also includes a gas source connected to the color development reactor. When potassium iodide is added to the color development reactor, the gas source introduces nitrogen or inert gas into the color development reactor to discharge oxygen generated in the color development reactor.

3. The ozone concentration measuring device according to claim 2, characterized in that: The device also includes a water supply mechanism, a color developer delivery pipe system is provided between the color development reactor and the liquid supply mechanism one and the liquid supply mechanism two, and a distilled water delivery pipe system is provided between the water supply mechanism and the liquid supply mechanism one and the liquid supply mechanism two, and liquid level sensors are provided in the color development reactor, the liquid supply mechanism one and the liquid supply mechanism two.

4. The ozone concentration metering device according to claim 3, characterized in that: When the sample liquid to be tested is extracted, the actual amount of the sample liquid added is detected by the liquid level sensor, and when the DPD solution is added, the actual amount of the DPD solution added is detected by the liquid level sensor.

5. The ozone concentration measuring device according to claim 4, characterized in that: The liquid supply mechanism 1 includes a dissolving tank, a material receiving assembly arranged in the dissolving tank, a material storage tank arranged above the dissolving tank, a discharge valve arranged at the bottom of the storage tank, and a discharge pipe arranged at the bottom of the discharge valve and extending into the dissolving tank. The storage tank is used to store solid color developer. The dissolving tank is provided with a load sensor. The load sensor is used to detect the weight of the solid color developer received by the material receiving assembly. The water level setting value is set according to the weight detection result. During the process of adding distilled water to the liquid supply mechanism, when the water level of the liquid supply mechanism reaches the water level setting value, the distilled water delivery pipeline is closed. The structure of the liquid supply mechanism 2 is the same as that of the liquid supply mechanism 1.

6. The ozone concentration measuring device according to claim 5, characterized in that: A rotating rod is fixedly arranged on the material receiving assembly, and the rotating rod is rotatably arranged at the bottom of the load sensor, and a driving member for driving the rotating rod to rotate is arranged on the dissolving tank.

7. The ozone concentration measuring device according to claim 6, characterized in that: The material receiving assembly consists of an outer cylinder and an inner cylinder fixed on the inner wall of the outer cylinder. A liquid discharge port is arranged on the outer wall of the outer cylinder. When receiving the solid color developer, the inner cylinder is located directly below the discharge pipe.

8. The ozone concentration measuring device according to claim 7, characterized in that: The distilled water delivery pipe system includes a shunt pipe arranged at the water outlet of the water supply mechanism, and a third water pump and two three-way valves arranged on the shunt pipe. The shunt pipe has a main pipe and two branch pipes corresponding to the two three-way valves respectively, and the third water pump is arranged on the main pipe.

9. The ozone concentration measuring device according to claim 8, characterized in that: The distilled water delivery pipe system also includes two drain pipes corresponding to the two branch pipes respectively, the two drain pipes are respectively connected to the two liquid supply mechanisms, and the three ports of the three-way valve are respectively connected to the corresponding branch pipes, the drain pipe and the discharge pipe.

10. The ozone concentration measuring device according to claim 9, characterized in that: The liquid supply pipe is provided with a bypass pipe for conveying nitrogen or inert gas, and the bypass pipe is provided with a solenoid valve, and the reaction tank and the discharge pipe are both provided with exhaust valves.

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